Petco has some nice deals on aquariums right now! Select aquariums are 50% off! These would be great for fish, and also small reptiles.
Check out a couple of these deals:
Aqueon Standard Glass Aquarium Tank 10 Gallon—$10.00 (Reg $19.99)
Aqueon Standard Glass Aquarium Tank 40 Gallon—$50.00 (Reg $99.99)